My company sites...

BucketSoft.com
Web performance optimization.

RegexHero.net
Powerful and easy to use .NET regex tester built in Silverlight.

CarSpecs.us
Find and research cars based on criteria that's important to you.

My personal sites...

swortham.blogspot.com
My personal blog (mostly programming stuff).

GLdomain.com
My OpenGL site. Most of the programs and tutorials are outdated by today's standards, but I suppose it could still be useful to someone.

060calculator.com
Calculate how fast your car will reach 60 mph from a standstill.